Regardless of whether Jarla can shoot, Elsa's spell just dealt a tremendous amount of damage. If that's not enough, Bardhyl can still get a few good licks in.
RossN, I know it sucks to be late to the fight because of a couple of failed Terror tests, but keep in mind that guns are expensive and have a small chance to blow up in your hand each time you use them. So I advise you use them sparingly, and only at short range if you can.